Pearson, 50, was Leeds' commercial director but left in 2001 in order to purchase Hull City, overseeing the Tigers' rise from the fourth tier to the Championship.
Most recently, Pearson has been working as an advisor at Sheffield Wednesday, but he has now chosen to leave Hillsborough in order to rejoin their Yorkshire rivals Leeds.
The former Derby County chairman will now work alongside Leeds owner Massimo Cellino, who certainly needs an extra pair of eyes and ears around Elland Road after a turbulent season.
Pearson will start his role as executive director immediately, and confirmed to the Leeds United official website that he will effectively be serving as Cellino's 'right hand man' at Elland Road.
"I’m here to assist Massimo as much as possible on all sides of the club and I’m really looking forward to it," said Pearson. "I’ll be like his right-hand man as executive director at the club, trying to get the club moving forward in the right lines and in tune with its supporters. We’re hopeful for a good season in the Championship next year," he added.
With doubts over the future of sporting director Nicola Salerno, Cellino will want more input from a man who has been around football and in particular Leeds United, and the Italian also said that Pearson will help him given that there is 'a lot of work to do' at Leeds in the coming months.
"Adam is coming here to be my right-hand man, to help me with everything that needs to be done. There is a lot of work to do," said Cellino. "He is a good man. He loves football and he knows this club well, that is important. Since I came back to Leeds, I have not stopped working, but Adam will help me now. I wanted him here at Leeds and I believe the working relationship will be positive."